Scala Language Currying Currying
Example
Let's define a function of 2 arguments:
def add: (Int, Int) => Int = (x,y) => x + y val three = add(1,2)
Currying add transforms it into a function that takes one Int and returns a function (from one Int to an Int)
val addCurried: (Int) => (Int => Int) = add2.curried // ^~~ take *one* Int // ^~~~ return a *function* from Int to Int val add1: Int => Int = addCurried(1) val three: Int = add1(2) val allInOneGo: Int = addCurried(1)(2)
You can apply this concept to any function that takes multiple arguments. Currying a function that takes multiple arguments, transforms it into a series of applications of functions that take one argument:
def add3: (Int, Int, Int) => Int = (a,b,c) => a + b + c + d def add3Curr: Int => (Int => (Int => Int)) = add3.curried val x = add3Curr(1)(2)(42)
